D3DXWeldVertices function
Welds together replicated vertices that have equal attributes. This method uses specified epsilon values for equality comparisons.
Syntax
HRESULT D3DXWeldVertices(
_In_ LPD3DXMESH pMesh,
_In_ DWORD Flags,
_In_ const D3DXWeldEpsilons *pEpsilons,
_In_ const DWORD *pAdjacencyIn,
_Inout_ DWORD *pAdjacencyOut,
_Out_ DWORD *pFaceRemap,
_Out_ LPD3DXBUFFER *ppVertexRemap
);
Parameters
-
pMesh [in]
-
Type: LPD3DXMESH
Pointer to an ID3DXMesh object, the mesh from which to weld vertices.
-
Flags [in]
-
Type: DWORD
Combination of one or more flags from D3DXWELDEPSILONSFLAGS.
-
pEpsilons [in]
-
Type: const D3DXWeldEpsilons*
Pointer to a D3DXWeldEpsilons structure, specifying the epsilon values to be used for this method. Use NULL to initialize all structure members to a default value of 1.0e-6f.
-
pAdjacencyIn [in]
-
Type: const DWORD*
Pointer to an array of three DWORDs per face that specify the three neighbors for each face in the source mesh. If the edge has no adjacent faces, the value is 0xffffffff. If this parameter is set to NULL, ID3DXBaseMesh::GenerateAdjacency will be called to create logical adjacency information.
-
pAdjacencyOut [in, out]
-
Type: DWORD*
Pointer to an array of three DWORDs per face that specify the three neighbors for each face in the optimized mesh. If the edge has no adjacent faces, the value is 0xffffffff.
-
pFaceRemap [out]
-
Type: DWORD*
An array of DWORDs, one per face, that identifies the original mesh face that corresponds to each face in the welded mesh.
-
ppVertexRemap [out]
-
Type: LPD3DXBUFFER*
Address of a pointer to an ID3DXBuffer interface, which contains a DWORD for each vertex that specifies how the new vertices map to the old vertices. This remap is useful if you need to alter external data based on the new vertex mapping.
Return value
Type: HRESULT
If the function succeeds, the return value is D3D_OK. If the function fails, the return value can be one of the following: D3DERR_INVALIDCALL, E_OUTOFMEMORY.
Remarks
This function uses supplied adjacency information to determine the points that are replicated. Vertices are merged based on an epsilon comparison. Vertices with equal position must already have been calculated and represented by point-representative data.
This function combines logically-welded vertices that have similar components, such as normals or texture coordinates within pEpsilons.
The following example code calls this function with welding enabled. Vertices are compared using epsilon values for normal vector and vertex position. A pointer is returned to a face remapping array (pFaceRemap).
TCHAR strMediaPath[512]; // X-file path
LPD3DXBUFFER pAdjacencyBuffer = NULL; // adjacency data buffer
LPD3DXBUFFER pD3DXMtrlBuffer = NULL; // material buffer
LPD3DXMESH pMesh = NULL; // mesh object
DWORD m_dwNumMaterials; // number of materials
D3DXWELDEPSILONS Epsilons; // structure with epsilon values
DWORD *pFaceRemap[65536]; // face remapping array
DWORD i; // internal variable
// Load the mesh from the specified file
hr = D3DXLoadMeshFromX ( strMediaPath,
D3DXMESH_MANAGED,
m_pd3dDevice,
&pAdjacencyBuffer,
&pD3DXMtrlBuffer,
NULL,
&m_dwNumMaterials,
&pMesh ) )
if( FAILED( hr ) )
goto End; // Go to error handling
// Set epsilon values
Epsilons.Normal = 0.001;
Epsilons.Position = 0.1;
// Weld the vertices
for( i=0; i < 65536; i++ )
{
pFaceRemap[i] = 0;
}
hr = D3DXWeldVertices ( pMesh,
D3DXWELDEPSILONS_WELDPARTIALMATCHES,
&Epsilons,
(DWORD*)pAdjacencyBuffer->GetBufferPointer(),
(DWORD*)pAdjacencyBuffer->GetBufferPointer(),
(DWORD*)pFaceRemap,
NULL )
if( FAILED( hr ) )
goto End; // Go to error handling
Requirements
| Requirement | Value |
|---|---|
| Header |
|
| Library |
|
See also